ELM327LP datasheet(91/94 Pages) ELM

91 / 94 page

Error Messages and Alerts (continued)

STOPPED

If any OBD operation is interrupted by a received

RS232 character, or by a low level on the RTS pin, the

ELM327 will print the word STOPPED. If you should

see this response, then something that you have done

has interrupted the ELM327. Most people see it

because they have not waited for pin 15 to go high, or

have not waited for the prompt character (‘>’) to be

displayed before sending the next command.

Note that short duration pulses on pin 15 may

cause the STOPPED message to be displayed, but

may not be of sufficient duration to cause a switch to

Low Power operation (as the Low Power circuit

debounces the signal, filtering them out).

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ELM327L

ELM327L DSA

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

ELM327L integrated circuits are 28 pin devices, available in either a 300 mil wide (‘skinny’) Plastic DIP format, or in

a 300 mil (7.50 mm body) SOIC surface mount type of package, or in a 208 mil (5.30 mm body) SSOP surface

mount package. We do not offer a QFN package.

To order, add the appropriate suffix (P, SM, or SS) to the ELM327L part number:

300 mil wide, 28 pin, 0.10” (2.54 mm) pitch, PDIP.............................................................................. ELM327LP

300 mil wide, 28 pin, 0.050” (1.27 mm) pitch, SOIC........................................................................ ELM327LSM

208 mil wide, 28 pin, 0.025” (0.65 mm) pitch, SSOP........................................................................ ELM327LSS

Ordering Information

Version History

We are often asked about the differences between

the firmware in the various ELM327 integrated circuits.

The ELM327L started with firmware v2.1:

v2.1

First version available. Supports all ELM327 v2.1

functions and:

- requires a 10µF capacitor on pin 6

- has a 2048 byte RS232 transmit buffer

UNABLE TO CONNECT

If you see this message, it means that the ELM327

has tried all of the available protocols, and could not

detect a compatible one. This could be because your

vehicle uses an unsupported protocol, or could be as

simple as forgetting to turn the ignition key on.

If you are sure that your vehicle uses an OBDII

protocol, then check all of your connections, and the

ignition, then try the command again.

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